Dichloromethane → Tert-butyl (5-(prop-1-en-2-yl)pyridin-3-yl)methylcarbamate

Participants

Reaction Steps

A solution of potassium isopropenyl trifluoroborate (464 mg, 3.13 mmol), PdCl2(dppf).CH2Cl2 (153 mg, 0.06 mmol), tert-butyl (5-bromopyridin-3-yl)methylcarbamate (900 mg, 3.13 mmol) and triethylamine (475 mg, 4.69 mmol) in i-PrOH—H2O (2:1, 30 mL) was heated under reflux in a nitrogen atmosphere. The reaction mixture was heated at reflux for 4 h, then cooled to rt and diluted with water (40 mL) followed by extraction with diethylether. The organic layers were combined and washed with brine, dried over sodium sulfate and then filtered. The solvent was removed under vacuum, and the crude product was purified by silica gel chromatography (eluting with 45% EtOAc/hexanes) to afford tert-butyl (5-(prop-1-en-2-yl)pyridin-3-yl)methylcarbamate as a white solid in 85% yield. (5-(prop-1-en-2-yl)pyridin-3-yl)methanamine was then generated by removal of the Boc protecting group by treatment with HCl (in methanol or dioxane) or trifluoroacetic acid in dichloromethane.

Provenance & Evidence